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Stronger and less porous engineering bricks (UK Class A) are usually blue due to the higher firing temperature whilst class B bricks are usually red. Class A bricks have a strength of 125 N/mm (18,100 lb
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as "fire-clay brick that has a dense and strong semi-vitreous body and which conforms to defined limits for water absorption and compressive strength".
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147:/sq in) and water absorption of less than 4.5%; Class B bricks have a strength greater than 75 N/mm (10,900 lb
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used where strength, low water porosity or acid (flue gas) resistance are needed. Engineering bricks can be used for
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British
Standard BS ISO 6707-1;2014 (buildings & civil engineering works - vocabulary - general terms)
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is a type of engineering brick that was used in the construction of the foundations in the
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https://shop.bsigroup.com/ProductDetail/?pid=000000000030257212
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and tools are available to assist in formatting, such as
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151:/sq in) and water absorption of less than 7%.
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114:on the West Coast Main Line
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